Abstract

We present experiments demonstrating sonic demultiplex devices able to separate spatially several wavelengths. The devices are based on clusters of circular scatterers whose position and size are determined by using an inverse design approach. Two prototypes are built and characterized, a first that spatially separates two wavelengths (i.e., 20.0 and ) and a second that separates three wavelengths: 20.0, 21.3, and . Both prototypes are typical examples of acoustic scattering elements, a name here introduced to define inverse designed devices that are characterized by their great adaptability in controlling the scatteringimage, including both the reflected and transmitted waves.

Received 19 December 2005Accepted 08 March 2006Published online 18 April 2006

Acknowledgments:

This work was partially supported by the Spanish Ministry of Science and Education (Project No. TEC2004-03545). One of the authors (A.H.) acknowledges his Ph.D. grant paid by Nanophotonic Technology Center of Valencia. The authors thank Professor J. Llinares and Dr. F. Meseguer for their permanent support. The technical facilities provided by the group ACARMA at the UPV are also gratefully acknowledged.